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        <button class="btnForVar">使用var按钮1</button>
        <button class="btnForVar">使用var按钮2</button>
        <button class="btnForVar">使用var按钮3</button> <br>
        <button class="closureVar">闭包var按钮1</button>
        <button class="closureVar">闭包var按钮2</button>
        <button class="closureVar">闭包var按钮3</button> <br>
        <button class="btnLet">使用let按钮1</button>
        <button class="btnLet">使用let按钮2</button>
        <button class="btnLet">使用let按钮3</button> <br>
        
        <script src="./dist/ConstVarLet.js"></script>
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